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# VBScript CDbl Function * * Complete VBScript Reference Manual](#) * * * The CDbl function converts an expression to Double precision (Double) type. The expression must be numeric. ### Syntax CDbl(expression) | Parameter | Description | | :--- | :--- | | expression | Required. Any valid expression. | ## Example ## Example 1 document.write(CDbl(134.345) & "
") Output of the above example: 134.345 [Try it yourself »](#) ## Example 2 document.write(CDbl(14111111113353355.345455) & "
") Output of the above example: 1.41111111133534E+16 [Try it yourself »](#) * * Complete VBScript Reference Manual](#)